driver: net: keystone_net: add support for rgmii phy

In K2G, Ethernet doesn't support SGMII instead it support RGMII,
adding support to the driver to connect to RGMII phy.

Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/arch/arm/include/asm/ti-common/keystone_net.h b/arch/arm/include/asm/ti-common/keystone_net.h
index 43a6568..a0d0d9b 100644
--- a/arch/arm/include/asm/ti-common/keystone_net.h
+++ b/arch/arm/include/asm/ti-common/keystone_net.h
@@ -193,6 +193,11 @@
 #define SGMII_RXCFG_REG(x)	(EMAC_SGMII_BASE_ADDR + SGMII_OFFSET(x) + 0x034)
 #define SGMII_AUXCFG_REG(x)	(EMAC_SGMII_BASE_ADDR + SGMII_OFFSET(x) + 0x038)
 
+/* RGMII */
+#define RGMII_REG_STATUS_LINK		BIT(0)
+
+#define RGMII_STATUS_REG		(GBETH_BASE + 0x18)
+
 /* PSS */
 #ifdef CONFIG_KSNET_NETCP_V1_0